If an airline is consistently good in betting on oil/fuel prices, then perhaps they should be in the hedge fund business instead of the airline business! I suppose it's much easier than running an airline, just set up an account and make money! No unions or nasty employees to deal with, and IF (heaven forbid) you lose money, then just pass the bill to the taxpayers!!
That is what happened with Enron, they strayed from their business of being an energy firm to that of a speculating financial machine that umtimately collapsed and had many knock on effects.
The danger for society is when big players in an industry (as with the banks) play too much and create systemic risk that threatens all aboard. A bit like two pilots getting too distracted playing on their laptops when they should be managing the aircraft.